This mosaic made out of books represents one of Colonial Mexico's most important literary figures.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

This museum houses two of Mexico's most impressive Aztec monoliths.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

Also known as the Founding Church of Scientology.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Obscure Freemasons still live in D.C.’s largest private residence.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

Now a public art piece, this curious metal feature originally advertised a tinsmith's services.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

A hidden world of exotic succulents and cacti.

Guarded by the Angel of Grief, the Stanford family tomb attracts an odd mix of halloween revelry and somber contemplation.

A humble garage, world-famous for being the epicenter of a technology revolution.

In 1998, Larry Page and Sergey Brin briefly ran their fledgling company from this Silicon Valley garage.

This redwood is a historic landmark, a town’s namesake, and the dancing sideline symbol of Stanford University.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

These sea caves are the source of Xigia Beach's distinct aroma.

These abandoned salt flats are now a haven for wildlife.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.